346 UNITED STATES GEOLOGICAL SURVEY OE THE TERRITORIES. 



Pyrifusiis (IVeptnnella) Ncwberryi, M. & H. 



Plate 31, figs. 6, a, b, c, <?, e, f. 



Fusus Newberryi, Meek and Haydeu (1856), Proceed. Acad. Nat. Sei. Pbilad., VIII, 66. 

 Fusus (Pyrifusiis 1) Newberryi, Meek and Hayden (1860), ih., XII, 421. — Meek (1864), Smithsonian Check- 

 List N. Am. Cret. Fossils, 22. 



Fi s- 39 - Shell rhorabic-subfusiform, rather thick ; spire conical, 



acute at the apex when not eroded ; volutions five, obliquely 

 flattened or a little concave above and convex around the 

 middle, where they are ornamented by a row of more or 

 less prominent, vertically-elongated nodes, or costal; last 

 turn comparatively large, and tapering rather abruptly into 

 the rather short, straight canal below ; surface marked by 

 distinct lines of growth, crossed by numerous well-defined, 

 round, thread-like, revolving lines; suture linear; aperture 

 rhombic-obovate, rather obtusely angular above, and nar- 

 rowing more gradually below; outer lip beveled ; inner lip 

 scarcely distinct from the slightly arcuate columella. 



Length, 1.43 inches; breadth, 0.81 inch; length of 

 aperture and canal, 0.87 inch; breadth of aperture, 32 



part of the outer lip, inch. Apical angle convex, regular, or even a little con- 

 not well shown in the . . inn 



figures on plate 3i. cave ; divergence variable, but usually about 60 to 65 . 



This species varies more or less in form, as well as in the prominence 

 of the node-like costse. In some individuals, the spire is more elevated and 

 the body-whorl proportionally much narrower than in others. The nodes, 

 or costae — of which about fifteen may be counted on the last turn — are usually 

 quite distinct on all the whorls, but in some specimens they become obsolete 

 on the last one, as represented in figure 6,f. The upper part of all the volu- 

 tions is generally more or less flattened and steeply sloping; and that part 

 of the body-whorl is often a little concave. The margin of the outer lip is 

 most prominent in outline a little below the middle, and more or less retreat- 

 ing, or broadly sinuous above the most prominent part of the volutions, as 

 shown by the lines of growth in the foregoing wood-cut. On the upper 

 sloping part of the whorls, the revolving lines are in most cases smaller, and 

 about equal to the spaces between ; farther down, however, they are generally 

 a little larger, rather more distant, and often have between each two of the 

 principal ones a smaller line. 



Pyrifusiis (Neptuiiella) 

 Neuberryi. 



A dorsal view, to 

 show the curves of 

 the lines of growth, 

 indicating a broad 

 sinuosity of the upper 



